/**
***********************************************************************
*
* Copyright 2011 Stefan Wöhle
*
* This file is part of PixelMath
*
* PixelMath is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* PixelMath is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with PixelMath. If not, see <http://www.gnu.org/licenses/>.
*
***********************************************************************
*/

#include "gvalue.h"
#include "formulaexception.h"
#include <QImage>

GValue::GValue(QObject *parent) :
    LocalizedFunction(parent)
{
}

double GValue::value(int x, int y)
{
    checkPreconditions(x, y);
    int xValue, yValue;

    xValue = (int)xFormula->value(x, y);
    yValue = (int)yFormula->value(x, y);

    if (xValue < 0 ||
        yValue < 0 ||
        xValue >= Formula::sourceImage.width() ||
        yValue >= Formula::sourceImage.height())
        throw FormulaException(tr("Calculated parameters are out of range."), PARAMS_OUT_OF_RANGE, this);

    return qGreen(Formula::sourceImage
                .pixel(xValue, yValue));
}

QString GValue::label()
{
    return QString("G");
}
